Pasteurizer.



No. 874,598. PATENTED DEG. 24, 1907. A. JENSEN.

PASTEURIZBR.

APPLICATION FILED JAN. 17, 1907.-

2 SHEETS-SHEET l.

PATENTED DEC. 24, 1907.

2 SHEETS-SHEET 2.

Smwnm @Sahne/bow 1 7 Inthe accompanying drawings, Figure 1 lUNITEDSTATES PATENT oFFiCE AAGE `JENSEN, OF EUREKA, CALIFORNIA.

ras'raumzxn.

The objects of the invention are to provide a machine of this character,the construction of which is such as to exclude the possibility of. anyerms commin ling taminating the liquid uring the process ofpasteurizing; in which the heating medium shall be utilized in' the mosteffective manner possible to accomplish the desired result; and

containing means for insuring that the proper temperature is maintainedin the heating medium.

is a vertical section of the apparatus; Fig. 2 is a section on the hne2- 2 of Fig. 1; Fig 3 is a broken side view; Fig. 4 is a section on tlieline 4-4 of Fig. 3; Fig. 5 is detail .vertical section of the steamstand pipe.

Referring to the drawings, 1 indicates the l 'i outer base section ofthemachine, supported upon legs 2,'. and secured by screws 27lon said outerbase is an inner or central base section 3, the central portion of whichis ex tended upwards to form a journal 4 for the rotating shaft 5. Saidshaft rotates upon an anti-friction disk 6, supported upon a steel vdisk7 adjustable by a screw 8 screwed into a pulley 15 secured on the mainshaft.16.

Saidmain shaft is journaled in a bracket 17 secured on the outercylindrical wall 18 of the machine', and reinforced by a plate 19 on theinside of said wall. Thus the main shaft,

carrying the loose `and tight pulleys, 20, 21,

transmits lpower derived from any distant source, to impart rotation tothe vertical vshaft 5.v l

22 indicates grease cups and 23 oiling conduits.

The upper end of the `journal 4 is formed with a cup 59 sulicientlylarge to retain any .Specification of Letters Patent. ApplioatlonledJanuary 17.1907. Serial No. 352.729.

with, and ,con-y Paulmann. 24,1907.

oil which should ascend from the oil cavity along the shaft 5, the oilthus accumulating being removed from time to time.

The outer wall 18 of the machine is also I the outer wall of the annularchamber 27 for thel heati `medium. The inner wall 24 of said cham er 27flares upwards, bein soldered at its lower edge to an annular s oulder28 formed on the inner base 3, and being soldered near its upper edge toa flanged ring- 25, secured by screws to the outer wall 18. Said innerwall 24 is extended above said ring 25, and is secured to the inner edgeof anannular trough 29, said inner edge making in cross section an acuteangle with said'inner wall 24. The outer side of the trough 29 is formedby a cylindrical'vertical wall 30, and withinsaid ,wall fits a cover 31open in the center. From onev side ot said trough 29 pxtends ahorizontal tangential spout or outet 32.

In the conical space contained within the wall 24 ofthe chamber 27rotates a conical impeller 26 having a wall formed of sheet metal,secured at its upper edge to an annular shoulder 34 formed on a casting35 havin a hub 36, resting u on a shoulder 37 forme upon the verticalsaft 5, and clamped down upon said shoulder by Infeans of a wing nut. 38screwed upon the threaded end of the shaft; The lower edgeof theimpeller wall is secured to the lower edge of the bell-shaped base 39formed at the upper end into a sleeve 40 closely surrounding the shaft5. Said base 39 is formed with an inwardly and downwardly extending rib42' upon which is the inner wall of the heating medium chambei' -27. pThe casting 35 extends horizontally or circumferentially beyond theshoulder 34 1 close to the vertical wall A30 to form an annular stoplate 44, its function being to hold down t e cream, milk or otherliquid. From said castin'g 35, just within the shoulder 34, extendsupwardly a circular wall 61, and the inner edge of the cover of themachine ts within close proximity to saidwall and thus excludes theentrance of germs.

-The li uidto be pasteurized is fed into a bowl l45, way valve 46 to apipe 47 assing into a chamber 4 8 formed between t e inner base 3 omwhich it flows through a three- 35 tures.

and the base 39 but, when the apparatus is in use, the liquid is bycentrifuga orce immediately drawn up into thernarrow annular asteurizingchamber 49 between the lmpelL ler and the inner Wall of the heatingchamber, and is carried upwards and discharged into the annular trough29, and passes thence by the horizontal s out 32. Y

The liquid is byt erotation of the impeller forced against the innerwall24 of the heating chamber 27, and is thereby heated to the required temerature, its temperature being ascertained y ins ection of a thermometer50 partly 'inclose in said chamber. The heating medium generally used ishot water heated by steam admitted by a pi e 51 controlled by a valve 52and connecte by an elbow 54 with a standpipe 53 lleading u through thebottom of the chamber 27, a'n secured in osition by locknuts 55 on bothsides of sai base. From said stand pipe extend, at suitable intervals,`nozzles 56, which .discharge vtangentially and in the oppositedirection to the direction of the rotatlon of the impeller. By means ofthe jets of steam discharged from the stand'pipe in a tangentialdirection, the water is given a rotary movement, and this has the effectof maintaining the temperature uniform throughout the heating chamber,and also of causing the heat ofthe water to be abstracted more rapidlyby the inner wall 24 of said chamber 27, than if the water werestationary, or circulated only by means of dierence of tempera- Theseadvantages, derived from the rotation of the water, are increased bythefact that said water, on one side of the inner wall 24 of the heatingchamber, and the milk, cream or other liquid, on the other side 40thereof, move in opposite directions. -The surplus water arising fromthe condensation of the steam discharges from an overflow pipe 57.

t will readily be seen that from the time l it enters the machine untilit leaves it, the

liquid to -be pasteurized can by no possibility be contaminated withgerms, for they apron 41 prevents any ofthe said liquid passing into thecup 50, and, in the process ,50 of being pasteuri'zed, the liquid passesonly.

between the outer continuous wall 26 of the impeller and the innercontinuous wall 24 of the heating chamber, and since these are smoothunbroken walls, except for the blades 43, the liquid cannot becontaminated in this part of its movement. When it arrives at theannular trough 29, it is also evidently well protected fromcontamination, first, by the annular stop plate 44, which extendssubstantially into contactl with the cover, and then by the coveritself, which again extends inwardly into contact with the wall 61 eX-tending upwards from the top of the impeller. Also any hot gas whichpasses upwards 65 from the heated liquid will pass through theinterstices between said stop plate 44,A cover 31 andwall 61 in anoutward direction, thus opposing the entrance of any germs `into liquid.

A. further advantage of this construction is that the Whole of the bodyof the impeller can b'e removed at any time from the vertical shaft, bymerely removing the cover and unscrewing the, jam nut, thus the aparatus is easy to keep clean. Any liquid lleft. within the interiorcavity of the heating chamber canbe readily drained off by means of thevalve 46. Y

I claim y 1. In a asteurizer, the combination with the upwar ly flaringconical inner wall of the chamber for a heating medium, and meansforsupplying heating fluid to said chamber, of a-conical impeller, avertical shaft, means for rotating the same, a casting secured upon theupper end of said shaft, having an annular shoulder to which the upperedge of the impelleriis secured, and a bell shaped base formed at itsupper end into a sleeve closely surrounding the shaft, the lower edge ofsaid impeller being secured to said base, substantially as described.

2. In a pasteurizer, the combination with the upwardly flaring conicalinner wall of a chamber for a heating medium, of a conical impeller, avertical shaft, means for rotating the same, a bell shaped base formedat' its upper end into a sleeve closely surroundin the shaft, said basehaving an inwardly and downwardly extending rib, and an apron securedupon said rib, substantially as described.

3. In a pasteurizer, the combination with the u wardly flaring conicalinner wall of a chamber for a heating medium, of a conical impeller,means for rotating said impeller within said inner wall, means forsupplying heating fluid to said chamber, and means for heating saidfluid comprising an apertured stand pipe within the heating chamber, and110 means or admitting steam to said stand pipe', said apertures openingin the opposite angular direction to that of the impeller, substantiallyas described.

4. In a pasteurizer, the combination of a p heating medium chamber, animpeller rotating within the same, means for rotating said impeller, andmeans for imparting to the heating fluid in said chamber a rotary motionin the opposite langular direction to that of the impeller,substantially as described.

5. In a pasteurizer, the combination of a heating medium chamberhavingan inner -wall and a trou h connected with the upper edge of saidwal an impeller-rotating Within said chamber, and comprising a castingat the top thereof, said casting extending circumferentiall into closeproximit to the outer Wall o the trough, .and sai casting having acircular Wall and an annular cover olosin said trough, the inner edge ofwhich extents into close proximity with said oireular wall,substantially as described.

6. In a pasteurizer, the combination with a heating medium chamber, of avertical shaft, a step bearing therefor, a journal for said shaft, animpeller having at the top a casting removably secured on said shaft andat the bottom a base having a sleeve surrounding said shaft, and anannular wall eonneeting said Casting and base, and rotating within theinnerfwall of the heatlng medium chamber, said casting having formedtherewith a stop plate to form the top of the trough into which theliquid is discharged, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

AAGE JENSEN.

Witnesses:

FRANK NAZRO, J. M. NrssoN.

